Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel

A technology of circulating fluidized bed and combustion device, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in a molten state, etc., and can solve the problem of high combustible content, short residence time and low boiler efficiency when burning active fly ash and other problems, to achieve the effect of stable conveying, reduced leakage and uniform air distribution

Active Publication Date: 2004-09-15
SOUTHEAST UNIV
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Problems solved by technology

At the same time, due to the high position of the flashback point and the "attached wall" effect, the residence time of the flashback fly ash in the high-temperature zone of the furnace is relatively short, resulting in the use of anthracite or lean coal with poor combustion activity and small-capacity fluidization with a low furnace height. The fly ash at the tail of the bed boiler has a high content of combustibles, the efficiency of the boiler is low, and a lot of energy is wasted

Method used

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  • Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel
  • Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel
  • Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel

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Embodiment 1

[0032] Embodiment 1 A kind of burning method of fly ash bottom feeding circulating fluidized bed for flame retardant fuel, use fly ash collector 1 such as: electrostatic precipitator to capture fly ash with higher combustible content in flue gas, make fly ash pass through The standpipe 2 enters the return controller 3, and then is sent to the return pipe by the delivery injector 5, and then returned to the dense phase area 41 in the bed by the high temperature resistant and wear-resistant bottom feeding nozzle 9 for combustion.

Embodiment 2

[0033]Embodiment 2 A combustion device for implementing the above method, consisting of a fly ash collector 1, a return controller 3, a pneumatic conveying injector 5 and a combustion furnace 4, the upper part of the combustion furnace 4 is connected with the fly ash collector 1 The fly ash collected by the fly ash collector 1, after passing through the return controller 3, is sent to the combustion chamber by the pneumatic conveying injector 5 through the bottom feeding nozzle 9 on the air distribution plate in the combustion furnace 4. In the dense-phase area 41 of the furnace 4, the return controller 3 includes a housing 31, a bed body 311 and an air chamber 312 are arranged in the housing 31, and an air distribution plate 32 is arranged between the bed body 311 and the air chamber 312. The chamber 312 is provided with an air inlet, and the bed body 311 is provided with a riser pipe 33 and ash pipe 34. And between the standpipe 33 and the lower ash pipe 34, a partition 35 i...

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PUM

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Abstract

The invention provides a kind of fly ash bottom feeding circular fluidized-bed combustion method and the device, the method is: uses fly ash collector to collect the fly ash with high content in smoke, the fly ash are put into the back material controller through vertical pipe, then and they are carried to the return pipe through transmitting and ejector, and they are returned to the thick phase area of bed through bottom feeding spraying muzzle which is high temperature resisting and corrosion resisting. The device is: it is made up of fly ash collector, back material controller, gas transmitting ejector and the combustion furnace. The top of the combustion furnace connects with the inlet of fly ash collector, the fly ash through the fly ash collector outlet, are carried to the thick phase area of combustion furnace through the bottom feeding sprayer with gas transmitting ejector. The invention can enhance the combustion effect of the fly ash; it can save energy and protect the environment.

Description

1. Technical field [0001] The invention relates to a combustion method and device for burning anthracite, lean coal or other difficult-to-combustible fuels, in particular to a combustion method and device for a fly ash bottom-fed circulating fluidized bed for difficult-to-combustible fuels. 2. Background technology [0002] The dominant coal resources in my country's energy structure are very rich, but low-volatile anthracite and high-ash and high-sulfur low-quality coal occupy a considerable proportion and are widely distributed. Fully and rationally utilizing this part of coal resources will have significant economic benefits and social benefits. [0003] Circulating fluidized bed combustion has outstanding advantages such as high combustion intensity, good combustion stability, and wide fuel adaptability. It can use fuels with high ash, high moisture, and low calorific value, such as: coal gangue, oil shale, and other boilers that are difficult to burn. Anthracite with a ...

Claims

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Application Information

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IPC IPC(8): F23C10/00F23C10/02
Inventor 金保升肖睿章名耀仲兆平兰计香
Owner SOUTHEAST UNIV
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